# Choral Lab — Chorale Harmonizer

> App for composing and studying Bach-style four-part chorales with automatic harmonization. (iPhone/iPad app by Martin Adler.)

- Source: https://appshunter.io/ios/app/choral-lab/id6782184585 (this page in markdown: same URL + `.md`)
- Developer: [Martin Adler](https://appshunter.io/developer/1896354791)
- Category: Music, Education
- Price: $6.99
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 18.0 · 97 MB
- Languages: American English, French (France), German (Germany), Italian, European Portuguese, European Spanish
- Released: 2026-06-25
- Data updated: 2026-08-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/choral-lab/id6782184585/reviews.md

## What is Choral Lab?

Choral Lab brings the art of four-part Bach chorale writing to your iPhone. Whether you're a composer, music student, or theory enthusiast, explore one of the most refined harmonic styles in Western music.

Harmonize your melodies. Draw a soprano line on the interactive piano roll and watch Choral Lab instantly generate alto, tenor, and bass voices following authentic Bach voice-leading rules — avoiding parallel fifths and octaves, resolving leading tones, and building natural cadences.

Browse 410 Bach chorales. Explore the complete corpus of J.S. Bach's four-part chorales with full score display, real-time chord analysis, and playback with rich choir sounds.

Two ways to read the music. Switch between a traditional four-part score view with proper notation and clefs, or a piano roll view to see the voice leading clearly laid out across time. Mute individual voices to focus on any single part or study how voices interact.

Generate original chorales. Let the app create complete chorales from scratch in any key — major or minor — with realistic harmonic progressions, passing tones, and Picardy thirds.

Study chord analysis. Follow along with real-time Roman numeral chord labels as the music plays.

Features:
• Interactive soprano piano roll with tie support
• Automatic SATB harmonization in Bach style
• Library of 410 J.S. Bach chorales
• Score view with Bravura music engraving font
• Piano roll view with per-voice muting
• Real-time chord analysis
• Choir, piano, and organ sounds
• MIDI export

## Key features

- Automatic SATB harmonization in Bach style
- Library of 410 J.S. Bach chorales
- Interactive soprano piano roll
- Real-time chord analysis
- Score and piano roll views
- MIDI export


## Frequently asked questions about Choral Lab

### What is Choral Lab?

Choral Lab is an application designed for composing and studying four-part Bach chorales. It offers features like automatic harmonization, a library of Bach's chorales, and real-time chord analysis.

### How does Choral Lab harmonize melodies?

You can draw a soprano line on the interactive piano roll, and Choral Lab will automatically generate alto, tenor, and bass voices following Bach's voice-leading rules, avoiding parallel fifths and octaves.

### Does Choral Lab have ads?

No, Choral Lab does not contain advertisements. It is a paid application with no ads.

### What devices does Choral Lab support?

Choral Lab is available for iPhone and iPad devices.

### How many Bach chorales are included in Choral Lab?

The app features a library of 410 complete four-part chorales by J.S. Bach, allowing users to explore and study them.

### Can I export my compositions from Choral Lab?

Yes, Choral Lab supports MIDI export, allowing you to export your generated chorales for use in other music software.

### What is the age rating for Choral Lab?

Choral Lab has an age rating of 4+, making it suitable for a wide range of users interested in music.

### How often is Choral Lab updated?

The latest version of Choral Lab is 1.1, which was last updated on August 3, 2026. Updates typically address bug fixes and feature enhancements.

## Version history (last 2 releases)

### 1.1 — 2026-08-03

Fixed a crash when exporting MIDI on iPad.

### 1.0 — 2026-06-25

No release notes.

## Apps similar to Choral Lab

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Polybeep](https://appshunter.io/ios/app/polybeep/id6471223455) | 4.7 (3) | $4.99 | Music |
| [SWAM Bass Tuba](https://appshunter.io/ios/app/swam-bass-tuba/id1470209763) | 4.7 (3) | $19.99 | Music |
| [Harmonics//](https://appshunter.io/ios/app/harmonics/id6769959361) | 5.0 (1) | $2.99 | Music |
| [The Alternative One!](https://appshunter.io/ios/app/the-alternative-one/id6479964220) | 5.0 (1) | Free | Music |
| [troooba](https://appshunter.io/ios/app/troooba/id6480323332) | 5.0 (1) | Free | Music |
| [Spectrum AUv3 FFT Visualizer](https://appshunter.io/ios/app/spectrum-auv3-fft-visualizer/id6737164438) | — | $0.99 | Music |

## More apps by Martin Adler

- [Reharmonizator](https://appshunter.io/ios/app/reharmonizator/id6767040541)
- [Neo-Riemannian](https://appshunter.io/ios/app/neo-riemannian/id6777607274)
- [Negative Harmony](https://appshunter.io/ios/app/negative-harmony/id6781442884)
- [Particls](https://appshunter.io/ios/app/particls/id6783961985)
- [Padscape](https://appshunter.io/ios/app/padscape/id6785107448)

All apps by Martin Adler: https://appshunter.io/developer/1896354791

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*